[The Plot: You — work for Fyodor Dostoyevsky. Fyodor contacted you from prison in some way, and asked to "take care" of Atsushi Nakajima. Perhaps you should follow him, or maybe earn this person's trust. Earn this person's trust, to use it later?]

...

It's night now.. Atsushi is walking down the street with some documents in his hands. He's probably going home. He also seems to be humming a tune to himself.